Improvement in let-off mechanisms for looms



'J. H. Moons.

LET OFF MECHANISM FOR Looms; No. 170,011 Patented Nuv. 16,,'18 75.

\NHTNES 5., \NYENTOR.

N. PETERS, PHOTO-LITHOGRAPHEH. WASHINGTON, D C.

UNITED STATES PATENT OFFICE;

JOHN H. MOORE, OF FISHERVILLE, NEW HAMPSHIRE.

I IMPROVEMENT IN L ET7OFF MECHANISMS FOR LOOMS.

Specification forming part of Letters Patent No. 170,011, dated November16, 1875; application filed August 11, 1875.

To all whom it may concern:

Be it known that I, JOHN H. MOORE, of Fisherville, Merrimack county, NewHampshire, have invented certain Improvements in Looms, of which thefollowing is a specification: a i

My invention relates to devices for producing tension of thewarp-threads; and it consists in a novel construction, combination, andarrangement of parts, which have for their ob ject to render the tensionon the warp-threads uniform, and thus improve the operation of the loom,as will be fully hereafter set forth.

The drawing is an elevation of the rear end of a loom. a

A represents'the side frames B, the warpbeam, secured on the shaft a,which has bearings at b in the side frames. 0 represents the warp, whichis Wound around the warp-beam.

It passes over the rod 0, and thence to the other mechanism of theloom.The warp-beam is provided at one extremity with the flange V d, and atthe other end with a grooved head,

D. e is a cross-beam, connecting the two side frames, situatedimmediately under and parallel with the warp-beam. fis a standard risingfrom the cross-beam c. From this standard projects a pin or stud, g, onwhich turns the triple-armed lever E E E The arms of this lever standvery nearly at equal angles to each other. From the extremity of the armE projects a pin, h, on which is pivoted a r' -shaped frame, i, in whichframe the roll F is pivoted. The arm E carries at its eX- tremity aweight, G, for keeping the roll F pressed against the warp-beam. H is alever, pivoted near the extremity of the cross-beam 6, under the head Dof the warp-beam, and I is a cord secured at one end to the lever H,and, passing around the head D, is secured at its other end to thecross-beam 0.

weight, which slides upon t-he lever H, and is connected with the lowerextremity of the arm E by the rod K. 7 But little explanation isnecessary to render it apparent that as the Warp Jisa' is unwound fromthe warp-beam the roller F will rise, being pressed against the warp onthe beam by the weight G, and that in rising the arm "E will, throughthe rod K, connecting it with the weight J, move this weight toward thefulcrum of the lever, thus diminishing the tension on the cord 1, andreducing the friction of this cord on the head D of the warp-beam, thuscompensating for the diminishing diameter of the roll of warp on thewarp-beam, and retaining an equal tension on the warp-threads. Thus,When'the beam is full,

the weight J is at the extremity of the lever,

exerting the greatest pull on the cord I, and creating-most friction onthe head I), and as the warp is unwound the weight travels inwardly, anddiminishes the friction on the thread.

It is obvious that various modifications of my invention may be made.

The arm E and its weight maybe dispensed with and a spring employed topress against the arm E.

A metal band may be substituted for the cord I, or a rigid brake may beemployed.

With a slightly-different construction and arrangement of parts the rodK may be dispensed with, and the arm E pivoted directly to the block iIndeed, so many modifications and alterations may be made by an ordinarymechanic that it would render this description prolix to recite them allherein.

I claim- The combination, with the warp-beam B, of the groovedfrictional head D, frictional cord I, lever H, sliding weight J, rod K,triplearmed lever E E E roll F, and weight Gr, constructed and operatingsubstantially in the manner described and specified.

JOHN H. MOORE. Witnesses:

H. F. BROWN, E. E. FLANDERS.

